<template>
  <a-upload
    v-model:file-list="fileList"
    name="file"
    list-type="picture-card"
    class="avatar-uploader"
    :show-upload-list="false"
    action="https://www.mocky.io/v2/5cc8019d300000980a055e76"
    :before-upload="beforeUpload"
    @change="handleChange"
  >
    <img v-if="imageUrl" :src="imageUrl" alt="avatar" />
    <div v-else>
      <loading-outlined v-if="loading"></loading-outlined>
      <plus-outlined v-else></plus-outlined>
      <div class="ant-upload-text">Upload</div>
    </div>
  </a-upload>
</template>
<script lang="ts">
import { PlusOutlined, LoadingOutlined } from "@ant-design/icons-vue";
import { message } from "ant-design-vue";
import { defineComponent, ref } from "vue";

interface FileItem {
  uid: string;
  name?: string;
  status?: string;
  response?: string;
  url?: string;
  type?: string;
  size: number;
  originFileObj: any;
}

interface FileInfo {
  file: FileItem;
  fileList: FileItem[];
}

function getBase64(img: Blob, callback: (base64Url: string) => void) {
  const reader = new FileReader();
  reader.addEventListener("load", () => callback(reader.result as string));
  reader.readAsDataURL(img);
}
export default defineComponent({
  components: {
    LoadingOutlined,
    PlusOutlined,
  },
  setup() {
    const fileList = ref([]);
    const loading = ref<boolean>(false);
    const imageUrl = ref<string>("");

    const handleChange = (info: FileInfo) => {
      if (info.file.status === "uploading") {
        loading.value = true;
        return;
      }
      if (info.file.status === "done") {
        // Get this url from response in real world.
        getBase64(info.file.originFileObj, (base64Url: string) => {
          imageUrl.value = base64Url;
          loading.value = false;
        });
      }
      if (info.file.status === "error") {
        loading.value = false;
        message.error("upload error");
      }
    };

    const beforeUpload = (file: FileItem) => {
      const isJpgOrPng =
        file.type === "image/jpeg" || file.type === "image/png";
      if (!isJpgOrPng) {
        message.error("You can only upload JPG file!");
      }
      const isLt2M = file.size / 1024 / 1024 < 2;
      if (!isLt2M) {
        message.error("Image must smaller than 2MB!");
      }
      return isJpgOrPng && isLt2M;
    };

    return {
      fileList,
      loading,
      imageUrl,
      handleChange,
      beforeUpload,
    };
  },
});
</script>
<style>
.avatar-uploader > .ant-upload {
  width: 128px;
  height: 128px;
}
.ant-upload-select-picture-card i {
  font-size: 32px;
  color: #999;
}

.ant-upload-select-picture-card .ant-upload-text {
  margin-top: 8px;
  color: #666;
}
</style>
